| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Bond-Alternating Antiferromagnetic S=1/2 Heisenberg Ladder with Ferromagnetic Diagonal Coupling |
| LI An-Kang, LU Jun-Zhe, MA Lei |
| Department of Physics, East China Normal University, Shanghai 200062 |
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| Cite this article: |
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LI An-Kang, LU Jun-Zhe, MA Lei 2009 Chin. Phys. Lett. 26 127502 |
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Abstract Using the density matrix renormalization group method, we determine the phase diagram of a frustrated bond-alternating S=1/2 Heisenberg ladder with ferro-antiferromagnetic couplings at zero temperature. With the interactions between spins along the rungs set, we identify three spin-gapped phases (the Haldane phase, the singlet phase and the dimer phase) in the whole parameter range. The analysis of our data shows that two-leg spin bond-alternating ladders have a rich phase diagram if both rung and diagonal couplings are taken into account.
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| Keywords:
75.10.Jm
75.50.Ee
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Received: 08 October 2009
Published: 27 November 2009
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| PACS: |
75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75.50.Ee
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(Antiferromagnetics)
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